:root {
  --bg: #f4f8ff;
  --bg-soft: #edf4ff;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-strong: rgba(255, 255, 255, 0.94);
  --line: rgba(25, 76, 160, 0.10);
  --text: #0f2342;
  --muted: #5f7496;
  --blue: #2563eb;
  --blue-2: #5b8cff;
  --cyan: #7dd3fc;
  --shadow: 0 24px 60px rgba(34, 76, 150, 0.12);
  --radius: 24px;
  --container: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, "Noto Sans SC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.10), transparent 28%),
    radial-gradient(circle at 86% 8%, rgba(125, 211, 252, 0.16), transparent 20%),
    linear-gradient(180deg, #f8fbff 0%, #f3f7ff 38%, #eef4ff 100%);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; }

.site-bg::before,
.site-bg::after {
  content: "";
  position: fixed;
  inset: auto;
  border-radius: 999px;
  filter: blur(60px);
  pointer-events: none;
  z-index: -1;
}
.site-bg::before {
  width: 280px;
  height: 280px;
  background: rgba(37, 99, 235, 0.12);
  top: 8%;
  right: 10%;
}
.site-bg::after {
  width: 220px;
  height: 220px;
  background: rgba(125, 211, 252, 0.16);
  bottom: 12%;
  left: 6%;
}

.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(18px);
  background: rgba(248, 251, 255, 0.78);
  border-bottom: 1px solid rgba(25,76,160,0.08);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 82px;
}

.brand img, .brand-logo { height: 64px; width: auto; }
.hero-brand-mark { margin-bottom: 10px; }
.hero-brand-mark img { height: 72px; width: auto; filter: drop-shadow(0 12px 24px rgba(37,99,235,.12)); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  color: var(--muted);
  font-weight: 500;
  transition: .2s ease;
}
.nav-links a:hover,
.nav-links a:focus-visible { color: var(--text); }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.menu-toggle {
  display: none;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.72);
  border-radius: 14px;
  padding: 10px;
}
.menu-toggle span {
  display: block;
  height: 2px;
  border-radius: 999px;
  background: #fff;
  margin: 6px 0;
}

.lang-btn,
.primary-btn,
.ghost-btn {
  border-radius: 999px;
  padding: 12px 20px;
  font-weight: 700;
  transition: .25s ease;
  border: 1px solid transparent;
}

.lang-btn {
  background: rgba(255,255,255,0.8);
  color: var(--text);
  border-color: rgba(37,99,235,0.12);
  cursor: pointer;
}

.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-2) 100%);
  color: #fff;
  box-shadow: 0 16px 34px rgba(37, 99, 235, 0.20);
}
.primary-btn:hover { transform: translateY(-2px); }

.ghost-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  background: rgba(255,255,255,0.72);
  border-color: rgba(37,99,235,0.12);
}
.ghost-btn:hover { background: rgba(255,255,255,0.08); }
.light { background: rgba(255,255,255,0.86); border-color: rgba(37,99,235,0.14); }
.primary-btn.light { background: #fff; color: #0a63ff; }

.hero {
  padding: 72px 0 44px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 34px;
  align-items: center;
}
.hero-copy h1 {
  font-size: clamp(2.5rem, 4.8vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  margin: 18px 0 18px;
  max-width: 11ch;
}
.lead {
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.8;
  max-width: 760px;
}
.hero-chip,
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.06);
  color: #31507c;
  border: 1px solid rgba(37, 99, 235, 0.12);
  font-size: 0.92rem;
  font-weight: 700;
}
.cta-row,
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.cta-row { margin: 30px 0 24px; }
.hero-badges span,
.trust-grid div,
.product-tag {
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.72);
  color: #36537f;
  border-radius: 999px;
  padding: 10px 14px;
  font-size: .93rem;
}

.hero-visual {
  position: relative;
  min-height: 540px;
}
.glass-panel,
.feature-card,
.product-card,
.solution-card,
.faq-item,
.info-card,
.cta-panel,
.table-wrap {
  background: var(--panel);
  border: 1px solid var(--line);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}
.signal-panel {
  padding: 28px;
  border-radius: 30px;
  min-height: 440px;
  position: relative;
  overflow: hidden;
}
.signal-panel::before {
  content: "";
  position: absolute;
  inset: -80px auto auto -60px;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(10,99,255,0.25), transparent 60%);
}
.signal-top {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #33507f;
  font-weight: 700;
  margin-bottom: 26px;
}
.status-dot {
  width: 10px;
  height: 10px;
  background: #34d399;
  border-radius: 999px;
  box-shadow: 0 0 0 6px rgba(103, 240, 170, 0.15);
}
.signal-metrics {
  display: grid;
  gap: 18px;
  position: relative;
  z-index: 1;
}
.signal-metrics > div {
  padding: 20px;
  border-radius: 22px;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(255,255,255,0.08);
}
.signal-metrics strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.02rem;
}
.signal-metrics p { margin: 0; color: var(--muted); line-height: 1.7; }

.floating-card {
  position: absolute;
  padding: 16px 18px;
  border-radius: 20px;
  min-width: 220px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}
.floating-card span {
  color: var(--cyan);
  font-size: .88rem;
  display: block;
  margin-bottom: 8px;
}
.floating-card strong { line-height: 1.4; }
.card-a { top: -12px; right: 28px; }
.card-b { left: -10px; bottom: 44px; }

.trust-strip { padding: 10px 0 36px; }
.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.trust-grid div {
  text-align: center;
  padding: 16px;
}

.section { padding: 84px 0; }
.section.alt { background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0)); }
.section-head { margin-bottom: 28px; }
.section-head.center { text-align: center; }
.section-head.narrow { max-width: 860px; margin-left: auto; margin-right: auto; }
.section-head h2 {
  font-size: clamp(1.9rem, 3.4vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 16px 0 14px;
}
.section-head p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 1.02rem;
}

.feature-grid,
.solution-grid,
.product-grid {
  display: grid;
  gap: 22px;
}
.feature-grid { grid-template-columns: repeat(3, 1fr); }
.solution-grid { grid-template-columns: repeat(3, 1fr); }
.product-grid { grid-template-columns: repeat(2, 1fr); }

.feature-card,
.product-card,
.solution-card {
  border-radius: var(--radius);
  padding: 28px;
}
.feature-icon,
.case-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(10, 99, 255, .9), rgba(114, 215, 255, .55));
  color: #fff;
  font-weight: 800;
  margin-bottom: 18px;
}
.feature-card h3,
.product-card h3,
.solution-card h3 {
  margin: 0 0 12px;
  font-size: 1.25rem;
}
.feature-card p,
.product-card p,
.solution-card p,
.faq-item p,
.site-footer p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}
.premium-grid .highlight {
  background: linear-gradient(180deg, rgba(10,99,255,0.18), rgba(255,255,255,0.03));
}
.product-tag {
  display: inline-block;
  margin-bottom: 16px;
}


.coverage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.coverage-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  border-radius: 20px;
  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: var(--shadow);
}
.coverage-item span {
  font-size: 1.35rem;
  line-height: 1;
}
.coverage-item strong {
  font-size: .98rem;
  letter-spacing: .01em;
}

.compare-section .table-wrap {
  overflow: auto;
  border-radius: 28px;
}
table {
  width: 100%;
  border-collapse: collapse;
  min-width: 850px;
}
th, td {
  padding: 18px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  text-align: left;
}
thead th {
  font-size: .95rem;
  color: #5f7ea8;
  background: rgba(255,255,255,0.78);
}
tbody td:last-child,
thead th:last-child {
  color: #3f7ee8;
  font-weight: 700;
}

.faq-list {
  display: grid;
  gap: 16px;
  max-width: 920px;
  margin: 0 auto;
}
.faq-item {
  border-radius: 22px;
  padding: 18px 22px;
}
.faq-item summary {
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  position: relative;
  padding-right: 26px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  color: var(--cyan);
}
.faq-item[open] summary::after { content: "−"; }
.faq-item p { padding-top: 16px; }

.dark-cta { padding-top: 10px; }
.cta-panel {
  border-radius: 32px;
  padding: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  background: linear-gradient(135deg, rgba(10,99,255,.26), rgba(6,20,40,.96));
}
.cta-copy h2 {
  margin: 14px 0 12px;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.15;
}
.cta-copy p { color: #d7e6fb; margin: 0; line-height: 1.8; max-width: 760px; }
.cta-logo { height: 56px; width: auto; }
.cta-actions.vertical {
  display: grid;
  gap: 14px;
  min-width: 210px;
}

.site-footer {
  padding: 72px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr .8fr .8fr .9fr;
  gap: 24px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-logo { height: 42px; margin-bottom: 16px; }
.site-footer h4 { margin: 0 0 14px; }
.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  color: var(--muted);
}
.site-footer li a:hover { color: var(--text); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 22px;
  color: #aabbd3;
  font-size: .94rem;
}

@media (max-width: 1080px) {
  .hero-grid,
  .feature-grid,
  .solution-grid,
  .footer-grid,
  .trust-grid,
  .product-grid,
  .coverage-grid { grid-template-columns: 1fr 1fr; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { min-height: auto; }
  .card-a, .card-b { position: relative; inset: auto; margin-top: 18px; }
}

@media (max-width: 760px) {
  .container { width: min(var(--container), calc(100% - 24px)); }
  .nav-wrap { min-height: 74px; }
  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 74px;
    left: 12px;
    right: 12px;
    flex-direction: column;
    align-items: flex-start;
    padding: 18px;
    border-radius: 20px;
    background: rgba(6, 15, 29, 0.96);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-actions .ghost-btn { display: none; }
  .hero { padding-top: 46px; }
  .hero-copy h1 { max-width: none; }
  .feature-grid,
  .solution-grid,
  .product-grid,
  .trust-grid,
  .coverage-grid,
  .footer-grid { grid-template-columns: 1fr; }
  .cta-panel,
  .footer-bottom { flex-direction: column; }
  .section { padding: 64px 0; }
  .feature-card,
  .product-card,
  .solution-card,
  .signal-panel,
  .cta-panel { padding: 22px; }
}

html[data-lang="en"] body { font-family: Inter, "Noto Sans SC", sans-serif; }
html[data-lang="zh"] body { font-family: "Noto Sans SC", Inter, "PingFang TC", "Microsoft JhengHei", sans-serif; }
html[data-lang="en"] .hero-copy h1 { font-size: clamp(2.9rem, 5.1vw, 5.4rem); letter-spacing: -0.045em; }
html[data-lang="zh"] .hero-copy h1 { font-size: clamp(2.4rem, 4.5vw, 4.6rem); letter-spacing: -0.03em; }
html[data-lang="en"] h2 { font-size: clamp(2rem, 3.2vw, 3.1rem); }
html[data-lang="zh"] h2 { font-size: clamp(1.8rem, 2.8vw, 2.7rem); }
html[data-lang="en"] .lead { font-size: 1.12rem; }
html[data-lang="zh"] .lead { font-size: 1.04rem; }
.coverage-item span { font-size: 1.45rem; }
.coverage-item strong { color: var(--text); }
summary { color: var(--text); font-weight: 700; }
.faq-item p { color: var(--muted); }
.signal-panel::before { background: radial-gradient(circle, rgba(37,99,235,0.14), transparent 60%); }


/* v6 refinements for fusesim.net */
.nav-links a {
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(37,99,235,0), rgba(37,99,235,.75), rgba(37,99,235,0));
  transform: scaleX(0.35);
  opacity: 0;
  transition: transform .24s ease, opacity .24s ease;
}
.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  transform: scaleX(1);
  opacity: 1;
}

.primary-btn,
.ghost-btn,
.lang-btn,
.coverage-item,
.feature-card,
.product-card,
.solution-card,
.faq-item,
.table-wrap {
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease, background-color .28s ease;
}

.primary-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 42px rgba(37, 99, 235, 0.24);
}
.primary-btn:active { transform: translateY(-1px) scale(.99); }

.ghost-btn:hover,
.lang-btn:hover {
  transform: translateY(-2px);
  background: rgba(255,255,255,0.96);
  border-color: rgba(37,99,235,0.22);
  box-shadow: 0 12px 28px rgba(34,76,150,0.10);
}

.feature-card:hover,
.product-card:hover,
.solution-card:hover,
.coverage-item:hover,
.faq-item:hover {
  transform: translateY(-5px);
  border-color: rgba(37,99,235,0.20);
  box-shadow: 0 28px 56px rgba(34,76,150,0.14);
}

.compare-section .table-wrap:hover {
  box-shadow: 0 30px 70px rgba(34,76,150,0.16);
  border-color: rgba(37,99,235,0.16);
}

tbody tr {
  transition: background-color .24s ease, transform .24s ease;
}

tbody tr:hover {
  background: linear-gradient(90deg, rgba(37,99,235,0.05), rgba(37,99,235,0.02));
}

tbody tr:hover td:first-child {
  color: #123768;
}

tbody tr:hover td:last-child {
  color: #1d5fe6;
}

thead th {
  color: #5678a8;
}

tbody td:last-child,
thead th:last-child {
  background: linear-gradient(180deg, rgba(37,99,235,0.06), rgba(37,99,235,0.02));
}


/* v7 final launch polish */
:root {
  --bg: #f7faff;
  --bg-soft: #eef5ff;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-strong: rgba(255,255,255,.96);
  --line: rgba(37, 99, 235, 0.12);
  --text: #102341;
  --muted: #5e7192;
  --blue: #1f63ff;
  --blue-2: #5c90ff;
  --shadow: 0 24px 60px rgba(35, 84, 170, 0.12);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(255,255,255,.48), rgba(255,255,255,0) 18%),
    radial-gradient(circle at 15% 20%, rgba(92, 144, 255, .07), transparent 24%),
    radial-gradient(circle at 88% 16%, rgba(31, 99, 255, .08), transparent 18%);
  z-index: -2;
}
.site-header {
  background: rgba(250, 252, 255, 0.82);
  box-shadow: 0 8px 28px rgba(16, 35, 65, 0.05);
}
.brand img, .brand-logo {
  height: 68px;
}
.nav-links a {
  font-weight: 600;
}
.hero {
  padding: 86px 0 52px;
}
.hero-grid {
  gap: 40px;
}
.hero-copy h1 {
  max-width: 12ch;
}
.hero-copy .lead {
  max-width: 820px;
}
.glass-panel,
.feature-card,
.product-card,
.solution-card,
.faq-item,
.info-card,
.cta-panel,
.table-wrap,
.coverage-item {
  background: linear-gradient(180deg, rgba(255,255,255,.9), rgba(255,255,255,.78));
}
.signal-panel {
  border-radius: 32px;
  min-height: 470px;
}
.signal-panel::after {
  content: "";
  position: absolute;
  inset: auto -30px -40px auto;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(125,211,252,.18), transparent 64%);
  pointer-events: none;
}
.signal-metrics > div,
.feature-card,
.product-card,
.solution-card,
.coverage-item,
.faq-item {
  position: relative;
  overflow: hidden;
}
.signal-metrics > div::before,
.feature-card::before,
.product-card::before,
.solution-card::before,
.coverage-item::before,
.faq-item::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.30), rgba(255,255,255,0) 42%);
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
}
.signal-metrics > div:hover::before,
.feature-card:hover::before,
.product-card:hover::before,
.solution-card:hover::before,
.coverage-item:hover::before,
.faq-item:hover::before {
  opacity: 1;
}
.primary-btn {
  background: linear-gradient(135deg, #195ef8 0%, #5c90ff 100%);
  box-shadow: 0 18px 40px rgba(31,99,255,.22);
}
.primary-btn:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: 0 24px 48px rgba(31,99,255,.25);
}
.ghost-btn,
.lang-btn {
  background: rgba(255,255,255,.84);
}
.ghost-btn:hover,
.lang-btn:hover {
  background: rgba(255,255,255,.98);
}
.feature-card:hover,
.product-card:hover,
.solution-card:hover,
.coverage-item:hover,
.faq-item:hover {
  transform: translateY(-7px);
}
.feature-icon,
.case-number {
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.5), 0 12px 28px rgba(31,99,255,.12);
}
.compare-section .table-wrap {
  overflow: hidden;
  border-radius: 28px;
}
thead th {
  color: #486b9b;
  font-weight: 800;
  background: linear-gradient(180deg, rgba(250,252,255,.98), rgba(240,246,255,.88));
}
thead th:last-child,
tbody td:last-child {
  background: linear-gradient(180deg, rgba(31,99,255,.08), rgba(92,144,255,.03));
}
tbody tr {
  border-bottom: 1px solid rgba(37,99,235,.06);
}
tbody tr:hover {
  transform: translateY(-1px);
  box-shadow: inset 0 0 0 999px rgba(31,99,255,.04);
}
tbody tr:hover td:last-child {
  color: #195ef8;
  font-weight: 800;
}
.floating-card {
  background: rgba(255,255,255,.9);
  border: 1px solid rgba(37,99,235,.14);
  box-shadow: 0 18px 40px rgba(35,84,170,.12);
}
.coverage-grid {
  gap: 16px;
}
.coverage-item {
  min-height: 120px;
}
.coverage-item strong {
  font-size: 1rem;
}
.cta-panel {
  background: linear-gradient(135deg, #134fcf 0%, #0d64ff 48%, #4f95ff 100%);
  box-shadow: 0 30px 70px rgba(20,79,207,.24);
}
.cta-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 15%, rgba(255,255,255,.18), transparent 24%),
    radial-gradient(circle at 82% 26%, rgba(255,255,255,.12), transparent 22%);
  pointer-events: none;
}
.site-footer {
  background: linear-gradient(180deg, rgba(234,242,255,.65), rgba(244,248,255,.88));
}
.footer-bottom {
  border-top: 1px solid rgba(37,99,235,.08);
}
@media (max-width: 980px) {
  .brand img, .brand-logo { height: 60px; }
  .hero { padding: 64px 0 38px; }
}
@media (max-width: 760px) {
  .brand img, .brand-logo { height: 56px; }
  .hero-copy h1 { max-width: none; }
  .cta-row { gap: 10px; }
}